Question

Which should be selected?

Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;Initial Catalog=myDataBase;User ID=myUsername;Password=myPassword;

or

Data Source=190.190.200.100;Network Library=DBMSSOCN;Initial Catalog=myDataBase;User ID=myUsername;Password=myPassword;

Answer 1

It depends – if your SQL Server runs on absolutely everything with their default settings, then you don’t need to specify neither the port, nor the protocol to use.

Just use:

Data Source=190.190.200.100;Initial Catalog=myDataBase;User ID=myUsername;Password=myPassword;

That should be enough.

If your server has custom settings, e.g. uses a custom port – then you must add that to your connection string, of course.

For a great many samples and explanations, see connectionstrings.com

PS: I personally would use

Server=190.190.200.100;Database=myDataBase;User ID=myUsername;Password=myPassword;

since I find Server and Database much clearer and more obvious than Data Source and Initial Catalog – from a functionality point of view, those two connection strings are identical (for SQL Server)